Spring weighing-scale.



E. MENZ.

SPRING WEIGHING SCALE.

APPLICATION FlLED'NOV.21|1913.

Patented June 1, 1915.

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Patented June 1, 1915.

Application fled November 21, 1818. Serial No. 802,298.

To all whom it may concern Be it known that I, EMIL Manz, a citizen of the United States, and a resident of Hamilton, county of Butler, and State of Ohio, have invented a certain new and useful Spring Weighing-Scale; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in

which like letters refer to like parts. The object of this invention is to improve the construction, of spring controlled barrel scales so that the same will automatically adjust and accommodate itself to temperature changes so as to have at all times uniformity of operation and indication.

The chief -feature of the invention consists in providin a thermostat in or as a part of the rack a1- by which the drum is actuated by the scale beam. In other words, the rack bar is formed of two arts secured rigidly to a thermostat located tween said arts, so as to vary the length of the rack ar to ofiset the variations of the spring.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims.

In thedrawings, Figure l is a side elevation of such a scale with parts in section. Fig. 2 is an elevation of a portion of the rack bar containing a thermostat. Fig. 3 is a rear elevation of the central part of j as n the drawings 10 represents a base, 11 the scale beam, l2'the platform, 13 the housing, 14 the drum and 15 the drum housing. On'a drum shaft 16 there isa pinion 17 with which the upper end of the rack bar 18 meshes, said rack bar being held in lace by a roller 19 on an arm 20 secured to t e drum housing, or by any other well known means, as this constitutes no part of the invention.

- The scale beam 11 is controlled by a sprin 21 which is secured tothe base and also t e bottom of the housing and also is secured to the scale beam by an adjusting screw 22. The lower end 23 of the rackbar is pivoted to an car 24 on the scale beam.

The adjacent ends of the two portions 18 and 23 of the rack bar are rigidly secured to a thermostat by screwing therein and being held thereon bv nuts 25, and so that the portions of the rack bar will be in alinement with each other. The particular thermostat herein shown is of horse shoe shape with an inner brass member 27 and an outer steel member 28 riveted together and the free ends secured to the members ofthe rack bar. With this arrangement under influence of heat the thermostat will contract and shorten the length of the rack bar to oppose the expansion of the spring and cold will expand the thermostat and increase the length of the rack bar to offset the contrac- 2. In a weighing scale having a housing,

a beam, :1 base, a spring between the beam and the base for'controllin the beam, a drum, a rack bar extending roin the beam to the drum for operating it, said rack bar consisting of two separate portions in alinement with each other, a thermostat consist ing of a horseshoe-shaped steel bar and a brass horseshoe-shaped .bar within the steel bar and rigidly secured thereto, and means for securing the ends of the portions of the rack bar to the ends of the thermostat, whereby the thermostat becomes a part of the rack bar.

In witness whereof, I have hereunto affixed my signature in the presence of the witnesses herein named. t

' EMIL .MENZ.

Witnesses:

H. EASTMAN, JNO. L. Jaoxson. 

